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Lens HRV vs Welltory: catalog facts
Lens HRV	Welltory
Free Free and open source under the GPL-3.0 licence.	Freemium Free to start, with some features in a paid subscription.
Android	Android, iOS
Uses only the phone camera, no extra sensors Open source and available on F-Droid	Combines data from wearables and phone measurements in one place Explains readings as plain guidance instead of raw numbers
Camera PPG is less precise than a chest strap Android only	Proprietary app with health data processed by the developer Not a medical device or a substitute for medical advice
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.